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2-Deoxyxanthosine

3,5-Di-o-acetyl-2-deoxyguanosine

2,3-Di-o-acetyl-5-deoxy-5-fluoro-n4-(isopentyloxycarbonyl)cytidine

3,5-Di-o-acetyl-5-bromo-2-deoxy-2-fluorouridine

3,5-Di-o-benzoyl-2-deoxy-2,2-difluorouridine

2,3-Di-o-benzoyl-n6-benzoyl-l-adenosine

3,5-O-(di-tert-butylsilanediyl)uridine

3,5-Diamino-3,5-dideoxyadenosine

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